Add initial docs for SQL Server schema creation and migration.

docs/sqlserver.md

@@ -19,14 +19,24 @@ stream Ids are strings there are a number of optimisations applied:
 
 Please refer to `CreateSchema.sql` for full schema details.
 
-# Initializing the Database
+## Initializing the Database
 
-TODO
+The SqlStreamStore database can be initialized in a few ways:
 
-# Using
+* **Via SQL Script**: In the project's [`ScriptsV3` folder](https://github.com/SQLStreamStore/SQLStreamStore/tree/master/src/SqlStreamStore.MsSql/ScriptsV3), you'll find [a `CreateSchema.sql` script](https://github.com/SQLStreamStore/SQLStreamStore/blob/master/src/SqlStreamStore.MsSql/ScriptsV3/CreateSchema.sql). Executing the SQL script within a database will install the schema.
+* **Via a method**: on the object for a given store, you can call `CreateSchemaIfNotExists()`. This will ensure the schema is created
 
-TODO
+## Checking Whether the Schema Matches
+
+On the object for a store, you can call `CheckSchema()` which will return a result on whether the schema matches expectations.
+
+This is ideal to run on startup / health checks
 
-# Migrating from V2 Schema to V3
+## Migrating from V2 Schema to V3
 
-TODO
+* **Via SQL Script**: In the project's [`ScriptsV3` folder](https://github.com/SQLStreamStore/SQLStreamStore/tree/master/src/SqlStreamStore.MsSql/ScriptsV3), you'll find [a `Migration_v3.sql` script](https://github.com/SQLStreamStore/SQLStreamStore/blob/master/src/SqlStreamStore.MsSql/ScriptsV3/Migration_v3.sql). Executing the SQL script within a database will migrate the schema from v2 to v3.
+* **Via method**: On the object for a store, you can call `Migrate()` which will migrate the schema.
+
+## Using
+
+TODO